book Maths Puzzle Numerical Ability

y = 4x + 2; y = 4x + b find the value of b

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book Other Question

find the opposite of 4/11. express yor answer as a common fraction? Hello...

I am having some trouble with a proof. I am to use:

(a + bi)(a - bi)

The problem asks:

Show that for a + bi not equal to 0 this product is a positive real number.

Thanks for your help.